Improvement in bit and drill-braces



GEORGE e. PARKERAND WILLIAM' P. D Onenor PaosPncr, New vonk.

Letters Patent No. 112,842, dated March 2l, 1871.

IMPROVEMENT IN BIT AND DRILL-BRACES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that we GEORGE G. PARKER andl WILLPAM P. DODGE, of Prospect, in the county of Oneida and State of New York, have invented a certain new and useful Improvement in Bit and Drill- Braces; and we do hereby declare the followingr to be a i'uil, clear, and exact description thereof, refer' ence being had to the accompanying drawing forming a part ofthe same, and in which- Figure 1 represents a view of my invention, partly in section and partly in elevation, applied 'to'an ordinary brace or stock and Figure 2 represents a section of the same taken through the line :t z ofg; 1, longitudinally.-

Similar letters of reference inthe several gures above alluded to indicate corresponding parts of my invention.

rl'lhis invention appertains to an improvement in bit and drill-braces or stocks, and consists of combining with an ordinary brace or stock and its shank or holder for receiving the hit or drill, which holder revolves within a cylindrical aperture or recess in said stock, two or more pinions or oogs and an epicycloidal wheel formed ou the anges of a disk, which is. provided with a neck fitting on the reduced portion of the shank of the brace, said neck of disk heilig furnished with a collar or coupling attachment, operated .by a screw-handle, all constructed and arranged substantially as hereinafter set forth and claimed.

To enable those skilled in the art to which our invention relates to make and use the same, we will proceed to describe its construction and operation.A

1n the annexed drawing- A designates an ordinary brace or stock, which is constructed with a cylindrical recess, c, to receive the upper end of the'shank 'or holder al, which receives the bit o2 or drill.

The shank or bit-holder a is formed or cut with an annular'recess, as seen in tig. 1.

a3 designates apiu passing diagonally through an aperture cut in the stock A, and entering the annulairecess of the shank al, for the purpose of holding the said shank in place in its socket or recess c ofthe said stock.

B designates'a cog or pinion, secured horizontally upon the vertical cylindrical shank a, and gearing with a similar cog, Bl, whose axle. or shaft has its bearing within a circular aperture in the stock A, as seen in the two figures, the lower side of said cog Bl being formed with an elevation or shoulder, which rests upon the disk or plate B2, but `not secured to it.

B2 is 'a disk or circular plate, the vertical liangev formed around the periphery of which is constructed with .an epicycloidal wheel, into the teeth of which enter the teeth of the cog B1.

This disk is also constructed with a neck or hollow shank, which embraces loosely the shank al of the stock A, as shown in g. 1, the said shank a1 being s o reduced, where the neckvof the disk B2 envelops it, as to form at the point where said neck terminates an annular shoulder,to support and retain the said neck tothe said'shank, which is illustrated by the figure last referred to.

C designates. a collar or coupler which surrounds the neck of the disk B2 and the enlarged portion of the holder or shank al, as seen in fig. l, and is constructed at its lower end with a semicircular recess, which receives the upper half of the cylindrical pin or stud b, fastened tothe shank al, when the said collar is slipped downward, sofas to unite the said neck and shank when desired. 1

The collar Gis constructed also with a hollow screwthreaded shank or neck, to receive the screw-threaded portion of the handle ot' the tightener D,v which is so constructed as to be easily grasped and turned or operated.

It will be observed that, by way of illustrating the operation of this machine, when the collar Gis slipped -down onto the shank al ofthe brace A, as shown in iig.

l, the motion imparted to said shank through the cog gearing B B1B2 when the brace A is revolved will be cut oli. from said shank, which receives the cuttingtool a2, converting the machineinto an ordinary brace but when it is thrown or moved up from olf the saidshank the latter will receive motion from said gear-v ing, which will. greatly augment its velocity when in operation. I

The tightenerD is intended to be firmly screwed in place when the collar C v.is either slipped down or thrown up, in order to hold the latter in its proper place, and also, forms a means whereby the brace and its tool-holder may be more rmly'held in the proper position, causing the operation ot' boring to be accurately and well performed.

Having thus described our invention,

What we claim, and desire to secure by LettersPa'tent, is

1. The combination of the collar or coupler C, having the tightener D, with the disk and shank B", andtool-holder a, substantially as herein described and for the purpose set forth.`

2. The combination ofthe brace or stock A, shank al, gearing B B1 B2, coupler C, and tightener D, sub- January, 18'? 1, in presence of two subscribing WitllQSSS.

. G. G. PARK-ER. Witnesses: WM: P. DODGE.

G. PUoHARn, J oner HUGHES.

sind effing 

